1970 Duster project in Sweden

Hopefully,you enjoyed your visit,Trebor... Grill restore,sure takes a lot of time....

Started cleaning the grill last night. It got a lot better, but there is still some really old grime on there that regular degreaser, hot water and soap can't seem to handle. I just push it around and smear it out. Especially hard to get it clean between the flanges. Do you know of a more effective way to get it clean? Break cleaner perhaps?